In order to access and use the NGC Deep Learning containers, you must have an NGC account. Only NGC account holders are authorized to run the containers.
When you login to your NGC account for the first time, you will see the Terms of Use (TOU) for the containers. Once you agree to the TOU, you can get your NGC API Key and save it away.
When you are ready to pull the NGC containers to your computer, you first do a ‘docker login nvcr.io’, give the username $oauthtoken and paste in your NGC APIKey as the password. Once you are logged in to nvcr.io, the docker pull command will work.
You can find full documentation on all of these steps at NGC Documentation